Spi 98-454-2 Steel Parallel Set 6x7/8x1/8 Inch

Product Description

The SPI 98-454-2 is a matched pair of hardened steel machinist parallels designed for precision setup and workholding applications in machine shops and tool rooms. Each parallel features four precision-ground faces, giving technicians multiple reference surfaces for consistent, accurate positioning of workpieces on mills, grinders, and surface plates. At 6 inches long, 7/8 inch high, and 1/8 inch thick, these are slender, stackable parallels well suited for low-clearance setups. Hardness is rated at 50 Rc, and squareness is held to 0.0005 inches per 1 inch, making them appropriate for close-tolerance work.

These parallels are used in metalworking environments where accurate part elevation and alignment are required. Common applications include vise setup on vertical mills, surface grinding fixture support, and layout work on granite or cast-iron surface plates. They are sold as a matched pair and are appropriate for use by machinists, toolmakers, and precision grinding technicians in both job-shop and production environments.

Key Features

• Four precision-ground faces provide multiple usable reference surfaces per parallel
• Hardness of 50 Rc resists wear and deformation during repeated use
• Squareness tolerance of 0.0005 inches per 1 inch for close-tolerance setups
• High-grade hardened tool steel construction for long service life
• Slender 1/8 inch thickness suits low-clearance vise and fixture applications
• Sold as a matched pair for balanced workpiece support

Compatibility

Designed as a general-purpose precision parallel for use with standard machinist vises, surface grinders, and mill setups requiring a 6-inch parallel in 1/8 inch thickness.

Installation Notes

These parallels are placed by machinists or toolmakers during workpiece setup; no power tools or mechanical fastening is required. Surfaces should be clean and free of chips or burrs before placing parallels to avoid false seating. Handle with care to avoid impact damage that could affect ground surfaces. Inspect periodically for nicks or corrosion that may compromise accuracy.